Pleasant Lake-Deep Spot
Rockingham County, New HampshireView mapDirections
NHDES publishes the water-quality measurements for Pleasant Lake-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
Pleasant Lake-Deep Spot in Rockingham County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Water clarity: 24.6 ft visibility. Phosphorus: 7.5 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
Pleasant Lake-Deep Spot is a mesotrophic lake in Rockingham County, New Hampshire. Limited fish-species data available. Public access is available. Compared to the 50 other monitored lakes in Rockingham County, Pleasant Lake-Deep Spot ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-07-23. Methodology: how these readings are compared.
What Pleasant Lake-Deep Spot is good for
From access and monitoring records, not editorial picks.
- Clear water24.6 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Pleasant Lake-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Whether Pleasant Lake-Deep Spot is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Pleasant Lake-Deep Spot
These are the measurements NHDES publishes for Pleasant Lake-Deep Spot, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 24.6 ft down. Phosphorus 7.5 µg/L. Chlorophyll-a 2.3 µg/L. TSI 34.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 24.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 7.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.3µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 34 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Pleasant Lake-Deep Spot
Answers come straight from the public measurements and survey records on this page.
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Fishing Pleasant Lake-Deep Spot
EPA Impairment Status
Pleasant Lake-Deep Spot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700060502-09-01 · Official waterbody report
Nearby Lakes in Rockingham County
Frequently asked questions about Pleasant Lake-Deep Spot
Where is Pleasant Lake-Deep Spot?
- Pleasant Lake-Deep Spot is a lake in Rockingham County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Pleasant Lake-Deep Spot?
- Pleasant Lake-Deep Spot in Rockingham County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Water clarity: 24.6 ft visibility. Phosphorus: 7.5 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
Is Pleasant Lake-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Pleasant Lake-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Can I fish at Pleasant Lake-Deep Spot?
- Public access to Pleasant Lake-Deep Spot is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
62 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330062 samples · 2020–2025
Analytical methods
- SECCHI DISK TRANSPARENCY USING A SCOPE
- SECCHI DISK TRANSPARENCY
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- CHLOROPHYLL A-B-C DETERMINATION (MODIFIED)
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database